#define _CRT_SECURE_NO_WARNINGS 1

//#include <stdio.h>
//int main()
//{
//    char a = -1;
//    signed char b = -1;
//    unsigned char c = -1;
//    printf("a=%d,b=%d,c=%d", a, b, c);
//    return 0;
//}

#include <stdio.h>
unsigned char i = 0;
int main()
{
    for (i = 0; i <= 255; i++)
    {
        printf("hello world\n");
    }
    return 0;
}